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Typical examples of the mean activation of an individual CMAr neuron responding only to positive or only to negative feedback. A. Activation of a group 1 neuron that responded only to positive feedback (in red; n = 72) and not to negative (in black; n = 12). B, Activation of a group 2 neuron that responded only to negative (in black; n = 65) and not to positive (in red; n = 111) feedback.
